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authorThara Gopinath <thara@ti.com>2010-01-19 17:30:51 -0700
committerPaul Walmsley <paul@pwsan.com>2010-01-19 17:30:51 -0700
commit883edfdd58419b0cc298db14ba25c26d55c6d1af (patch)
tree8b651df7b5c288c7176346be4e2828242398066c /arch/arm/mach-omap2
parent7284ce6c9f6153d1777df5f310c959724d1bd446 (diff)
OMAP3: hwmod: Adding flag to prevent caching of sysconfig register.
In the current implementation the sysconfig value is read into _sysc_cache once and an actual update to the sysconfig register happens only if the new value paased is differnt from the one in _sysc_cache. _sysc_cache is updated only if _HWMOD_SYSCONFIG_LOADED is not set. This can lead to the follwing issue if off mode is enabled in modules which employs "always-retore" mechanism of context save and restore. a. The module sets the sysconfig register through omap_device_enable. Here _sysc_cache is updated with the value written to the sysconfig register and left. b. The power domain containig the module enters off mode and the module context is lost. c. The module in use becomes active and calls omap_device_enable to enable itself. Here a read of sysconfig register does not happen as _HWMOD_SYSCONFIG_LOADED flag is set. The value to be written to the sysconfig register will be same as the one written in step a. Since _sysc_cache reflects the previous written value an update of the sysconfig register does not happen. This means in modules which employs "always-restore" mechanism after off , the sysconfig regsiters will never get updated. This patch introduces a flag SYSC_NO_CACHE which if set ensures that the sysconfig register is always read into _sysc_cache before an update is attempted. This flags need to be set only by modules which does not do a context save but re-initializes the registers every time the module is accessed. This includes modules like i2c, smartreflex etc. Signed-off-by: Thara Gopinath <thara@ti.com> [paul@pwsan.com: tweaked to apply on a different head, added flag comment] Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch/arm/mach-omap2')
-rw-r--r--arch/arm/mach-omap2/omap_hwmod.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index d8c8545875b..478ae585ca3 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -94,7 +94,8 @@ static int _update_sysc_cache(struct omap_hwmod *oh)
oh->_sysc_cache = omap_hwmod_readl(oh, oh->sysconfig->sysc_offs);
- oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
+ if (!(oh->sysconfig->sysc_flags & SYSC_NO_CACHE))
+ oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
return 0;
}